_pyio.py 文件源码

def _peek_unlocked(self, n=0):
        want = min(n, self.buffer_size)
        have = len(self._read_buf) - self._read_pos
        if have < want or have <= 0:
            to_read = self.buffer_size - have
            while True:
                try:
                    current = self.raw.read(to_read)
                except IOError as e:
                    if e.errno != EINTR:
                        raise
                    continue
                break
            if current:
                self._read_buf = self._read_buf[self._read_pos:] + current
                self._read_pos = 0
        return self._read_buf[self._read_pos:]